06-07-2023, 09:50 AM
I finally got around to buying one of these, and I think I've made a very accurate model of the lens.
I made a series of paper templates, with different radii cut out, and the 65mm radius seems to be a perfect match:
The back of the lens is completely flat:
I haven't been able to remove the lens, so I placed a spacer on the back of the lens, measured the total thickness of the lens and spacer, then subtracted the thickness of the spacer to get a lens thickness of 13mm. I assumed the perimeter of the lens has the same dimensions as the perimeter of the retaining ring. Here is the model I ended up with (Link to STL).
I made a series of paper templates, with different radii cut out, and the 65mm radius seems to be a perfect match:
The back of the lens is completely flat:
I haven't been able to remove the lens, so I placed a spacer on the back of the lens, measured the total thickness of the lens and spacer, then subtracted the thickness of the spacer to get a lens thickness of 13mm. I assumed the perimeter of the lens has the same dimensions as the perimeter of the retaining ring. Here is the model I ended up with (Link to STL).